Method for collecting and quantitatively characterizing microcosmic distribution images of remaining oil in porous media

Abstract

The invention provides a method for collecting and quantitatively characterizing microcosmic distribution images of remaining oil in porous media. The method comprises the steps that the distribution images of the remaining oil are collected; the distribution images of the remaining oil are preprocessed and divided; the divided distribution images of the remaining oil are reconstructed in a three-dimensional mode; statistics is made on information of the remaining oil; the feature parameters of the remaining oil are calculated. According to the method for collecting and quantitatively characterizing the microcosmic distribution images of the remaining oil in the porous media, the microcosmic distribution images of the remaining oil in the porous media during different displacement moments can be collected and characterized quantitatively, the microcosmic distribution state of the remaining oil in a core can be described quantitatively on the basis, and an effectively tool is provided for the study of increasing oil recovery.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a method for image acquisition and quantitative characterization of the microscopic distribution of remaining oil in porous media. Background technique [0002] Due to the differences in pore structure, rock wettability, injection methods and other conditions, a considerable part of crude oil remains in the reservoir pores and on the surface of particles during the oilfield development process to form residual oil. The research on the microscopic distribution state of remaining oil is of great significance to further tap remaining oil and enhance oil recovery. [0003] At present, the commonly used research methods for the microscopic distribution of remaining oil in porous media include glass etching model (GMM), core microscopic model (SMM) and nuclear magnetic resonance imaging (NMR). [0004] The glass etching model can truly reflect the microscopic pore structure o...

AI Technical Summary

Problems solved by technology

[0004] The glass etching model can truly reflect the microscopic pore structure of rocks, and the microscopic distribution of remaining oil can be directly observed and described through a microscope, but there is still a big gap between the rock surface properties and pore geometric characteristics of this model and the real core. ; The core microscopic model uses the actual core thin section to make a microscopic visualization model, and the image definition of this model is poor; the above two methods are based on the two-dimensional microscopic model to study the remaining oil in a certain seepage section, which cannot reflect the remaining oil. The real distribution state in three-dimensional space

Images